5611681 has 2 divisors, whose sum is σ = 5611682. Its totient is φ = 5611680.

The previous prime is 5611663. The next prime is 5611687. The reversal of 5611681 is 1861165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4477456 + 1134225 = 2116^2 + 1065^2 .

It is a cyclic number.

It is not a de Polignac number, because 5611681 - 2⁷ = 5611553 is a prime.

It is a super-2 number, since 2×5611681² = 62981927291522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5611687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2805840 + 2805841.

It is an arithmetic number, because the mean of its divisors is an integer number (2805841).

Almost surely, 2^5611681 is an apocalyptic number.

It is an amenable number.

5611681 is a deficient number, since it is larger than the sum of its proper divisors (1).

5611681 is an equidigital number, since it uses as much as digits as its factorization.

5611681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 28.

The square root of 5611681 is about 2368.8986892647. The cubic root of 5611681 is about 177.7041861061.

The spelling of 5611681 in words is "five million, six hundred eleven thousand, six hundred eighty-one".